Initial project setup: Next.js frontend + .NET 9 backend

- Frontend: Next.js 16 + shadcn/ui + Tailwind CSS 4
- Backend: .NET 9 Web API with Npgsql health check
- Docker Compose for prod and dev environments
- Woodpecker CI pipeline for auto-deploy
- Health check endpoints for E2E testing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/src/GBSite.Api/Controllers/HealthController.cs

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+using Microsoft.AspNetCore.Mvc;
+using Npgsql;
+
+namespace GBSite.Api.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+public class HealthController : ControllerBase
+{
+    private readonly IConfiguration _configuration;
+
+    public HealthController(IConfiguration configuration)
+    {
+        _configuration = configuration;
+    }
+
+    [HttpGet]
+    public async Task<IActionResult> Get()
+    {
+        var connectionString = _configuration.GetConnectionString("Default");
+        var dbStatus = "not configured";
+
+        if (!string.IsNullOrEmpty(connectionString))
+        {
+            try
+            {
+                await using var conn = new NpgsqlConnection(connectionString);
+                await conn.OpenAsync();
+                await using var cmd = new NpgsqlCommand("SELECT 1", conn);
+                await cmd.ExecuteScalarAsync();
+                dbStatus = "connected";
+            }
+            catch (Exception ex)
+            {
+                dbStatus = $"error: {ex.Message}";
+            }
+        }
+
+        return Ok(new
+        {
+            status = "healthy",
+            database = dbStatus,
+            environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "unknown"
+        });
+    }
+
+    [HttpGet("ping")]
+    public IActionResult Ping()
+    {
+        return Ok(new { status = "pong" });
+    }
+}

backend/src/GBSite.Api/GBSite.Api.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.4" />
+    <PackageReference Include="Npgsql" Version="10.0.1" />
+  </ItemGroup>
+
+</Project>

backend/src/GBSite.Api/GBSite.Api.http

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+@GBSite.Api_HostAddress = http://localhost:5224
+
+GET {{GBSite.Api_HostAddress}}/weatherforecast/
+Accept: application/json
+
+###

backend/src/GBSite.Api/Program.cs

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+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddControllers();
+builder.Services.AddOpenApi();
+
+var app = builder.Build();
+
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi();
+}
+
+app.MapControllers();
+
+app.Run();

backend/src/GBSite.Api/Properties/launchSettings.json

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+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": false,
+      "applicationUrl": "http://localhost:5224",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

backend/src/GBSite.Api/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

backend/src/GBSite.Api/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}